一、效果图
1.点击显示菜单栏，点击x号关闭；
2.点击一级菜单，展开显示二级，并且加号变为减号；
3.点击其他一级导航，自动收起展开的导航。
二、代码实现
<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><meta http-equiv="content-language" content="zh-CN" /><meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no" /><meta name="apple-mobile-web-app-capable" content="yes" /><meta name="apple-mobile-web-app-status-bar-style" content="black" /><meta name="format-detection" content="telephone=no" /><meta name="Keywords" content="" /><meta name="Description" content="" /><meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"><title></title><script src="static/js/jquery-1.11.3.js" type="text/javascript" charset="utf-8"></script><style>.header {position: relative;height: 100px;padding: 30px;box-sizing: border-box;}.header .header-right {position: relative;float: right;}.header .l-toggle {float: left;width: 38px;height: 20px;cursor: pointer;z-index: 99;position: relative;}.header .l-toggle span {position: absolute;top: 0;right: 0;left: 0;display: block;width: 26px;height: 2px;background-color: #000;}.header .l-toggle .line1 {margin: 0 auto;-webkit-transform: rotate(0);-ms-transform: rotate(0);transform: rotate(0);-webkit-transition: margin .3s .5s ease, -webkit-transform .5s ease;transition: margin .3s .5s ease, transform .5s ease;}.header .l-toggle .line2 {margin: 8px auto 0;}.header .l-toggle .line3 {margin: 16px auto auto;-webkit-transform: rotate(0);-ms-transform: rotate(0);transform: rotate(0);-webkit-transition: margin .3s .5s ease, -webkit-transform .5s ease;transition: margin .3s .5s ease, transform .5s ease;}.header .l-toggle.hover span {background: #828282;}.header .l-toggle.hover .line1 {-webkit-transform: rotate(45deg);-ms-transform: rotate(45deg);transform: rotate(45deg);margin: 8px auto 0;-webkit-transition: margin .3s ease, -webkit-transform .5s .3s ease;transition: margin .3s ease, transform .5s .3s ease;}.header .l-toggle.hover .line3 {-webkit-transform: rotate(-45deg);-ms-transform: rotate(-45deg);transform: rotate(-45deg);margin: 8px auto 0;-webkit-transition: margin .3s ease, -webkit-transform .5s .3s ease;transition: margin .3s ease, transform .5s .3s ease;}.header .sub-menu {width: 217px;height: auto;position: absolute;right: 30px;top: 20px;z-index: 2;background: rgba(255, 255, 255, 0.83);padding: 70px 24px 30px;box-sizing: border-box;display: none;border: 1px solid rgba(0, 0, 0, 0.2);}.header.active .line {height: 100vh;background: rgba(130, 130, 130, 0.3);}.header .sub-menu_ul {width: 100%;padding: 0;}.header .sub-menu_ul li {width: 100%;margin-bottom: 20px;font-family: Microsoft YaHei UI;position: relative;text-align: right;list-style: none;}.header .sub-menu_ul li .li_title {display: flex;align-items: center;justify-content: space-between;font-size: 18px;font-weight: bold;color: #ABABAB;/* color: #333333; */cursor: pointer;}.header .sub-menu_ul li .li_title span {color: #858585;font-size: 20px;display: none;}.header .sub-menu_ul li .li_title .spanAdd {display: block;}.menu_li_active .spanAdd {display: none !important;}.menu_li_active .spanSub {display: block !important;}.menu_li_active a {color: #333 !important;top: -7px !important;}.header .sub-menu_ul li .li_title a {position: absolute;right: 0;top: -14px;z-index: 999;font-size: 18px;font-weight: bold;color: #ABABAB;width: 66%;}.header .sub-menu_ul li a {width: 100%;display: block;font-size: 14px;font-weight: 400;color: #333333;margin-top: 15px;transition: 0.5s;text-decoration: none;}.header .sub-menu_ul li a:hover {text-decoration: underline;}.header .sub-menu_ul li .li_con {display: none;}</style></head><body><!-- 头部 --><header class="header"><div class="header-right"><div id="toggle" class="l-toggle"><span class="line1"></span><span class="line2"></span><span class="line3"></span></div></div><div class="sub-menu"><ul class="sub-menu_ul"><li><div class="li_title"><span class="spanAdd">+</span><span class="spanSub" style="font-size: 29px;">-</span><a href="aboutHongtian.html">走进鸿天</a></div><div class="li_con"><a href="aboutHongtian.html">关于鸿天</a><a href="aboutHistory.html">发展历程</a><a href="aboutCulture.html">企业文化</a><a href="aboutHonors.html">荣誉资质</a><a href="aboutBrand.html">企业品牌</a></div></li><li><div class="li_title"><span class="spanAdd">+</span><span class="spanSub" style="font-size: 29px;">-</span><a href="savingList.html">集团业务</a></div><div class="li_con"><a href="savingEnvirProtection.html">ODM供应链</a><a href="savingEnvirProtection.html">品牌零售</a></div></li><li><div class="li_title"><span class="spanAdd">+</span><span class="spanSub" style="font-size: 29px;">-</span><a href="savingList.html">技术研发</a></div><div class="li_con"><a href="savingEnvirProtection.html">研发中心</a><a href="savingEnvirProtection.html">印绣中心</a><a href="savingEnvirProtection.html">检测中心</a></div></li><li><div class="li_title"><span class="spanAdd">+</span><span class="spanSub" style="font-size: 29px;">-</span><a href="savingList.html">可持续发展</a></div><div class="li_con"><a href="savingEnvirProtection.html">节能环保</a><a href="savingEnvirProtection.html">慈善公益</a><a href="savingEnvirProtection.html">校企合作</a></div></li><li><div class="li_title"><span class="spanAdd">+</span><span class="spanSub" style="font-size: 29px;">-</span><a href="focusHongtian.html">聚焦鸿天</a></div><div class="li_con"><a href="focusHongtian.html">企业动态</a><a href="focusHongtian.html">品牌动态</a><a href="focusHongtian.html">鸿天人家</a><a href="focusHongtian.html">红色党建</a></div></li><script>$(function() {$('.sub-menu_ul li').click(function() {$(this).find('.li_con').slideToggle()$(this).siblings().find('.li_con').slideUp()if ($(this).hasClass('menu_li_active')) {$(this).removeClass('menu_li_active')} else {$(this).addClass('menu_li_active').siblings().removeClass('menu_li_active')}})})</script></ul></div></header><script>$(function() {$(".l-toggle").on('click', function() {var _this = $(this);if (!$(this).hasClass('hover')) {$(this).addClass('hover');$(this).children('.line2').stop(true, true).fadeOut(300);$(this).parents(".header-right").siblings('.sub-menu').stop().fadeIn();} else {$(this).removeClass('hover');$(".header").removeClass("active");$(this).children('.line2').stop(true, true).fadeIn(300);$(this).parents(".header-right").siblings('.sub-menu').stop().fadeOut();}});})</script></body>
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